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Bug bounty program

CP

Cloudflare Public Bug Bounty

Open on HackerOneAtlas
Platform
HackerOne
Bounties
Pays
Assets in scope
51
Disclosed reports
44
Subdomains
24,298
Vendor on CyberSIXT
Cloudflare (70 CVEs, 0 exploited)

Most upvoted reports44

All reports
Most upvoted reports of Cloudflare Public Bug Bounty
ReportWeaknessDisclosedBountyVotes
HTTP Request Smuggling in Transform Rules using hexadecimal escape sequences in the concat() functionAnalysed#1478633Injection and Smuggling2022-05-16$6,000116
Cloudflare CASB Confused Deputy ProblemAnalysed#1952124No weakness recorded2023-06-07$3,30097
Using special IPv4-mapped IPv6 addresses to bypass local IP banAnalysed#1785260No weakness recorded2023-01-24$7,50078
Bypass of Cloudflare's Cache Keys and WAF via header overflow#3027461Access Control2025-11-18–77
Hijack all emails sent to any domain that uses Cloudflare Email ForwardingAnalysed#1419341Access Control2022-07-28$6,00076
`use-mcp`'s oauth2 process uses a window.open call with untrusted mcp server provided data allowing for code execution under the page using itAnalysed#3211031Cross-site Scripting2025-09-30$55075
Yet Another CASB Integration Takeover of Active IntegrationsAnalysed#2094346No weakness recorded2023-11-13–68
[Variation of #3321406] YetAnother 1-Click Chaining of Self-XSS, Cookie Tossing and AntiCSRF Token Prediction leads to auto approval in AccessTempAuthAnalysed#3423950Cross-site Scripting2026-04-14–63
AI Playground XSS to steal user-chat messages and access to connected MCP ServerAnalysed#3424998Cross-site Scripting2026-02-26–62
Bypass R2 payment screenAnalysed#2170559Authentication2023-11-10$35057

Subdomains24,298

Root
Scope
Name suggests
First seen
Text file24,298 names
Subdomains of Cloudflare Public Bug Bounty
NameScopeFirst seen
wasmssh.labs-staging.cloudflare.comstagingIn scope2026-11-14
webssh.labs-staging.cloudflare.comstagingIn scope2026-11-14
api.labs.cloudflare.comapiIn scope2026-11-14
apjc.labs.cloudflare.comIn scope2026-11-14
apjc-v2.labs.cloudflare.comIn scope2026-11-14
apwest.labs.cloudflare.comIn scope2026-11-14
astriddb.labs.cloudflare.comIn scope2026-11-14
aueast.labs.cloudflare.comIn scope2026-11-14
bulk.labs.cloudflare.comIn scope2026-11-14
bulk-staging.labs.cloudflare.comstagingIn scope2026-11-14
cdn.labs.cloudflare.comIn scope2026-11-14
upload.cdn.labs.cloudflare.comdataIn scope2026-11-14
cml-active-pod-evaluator.labs.cloudflare.comIn scope2026-11-14
cml-bastion-apjc.labs.cloudflare.comIn scope2026-11-14
cml-bastion-apjc-default.labs.cloudflare.comIn scope2026-11-14
cml-sso-proxy.labs.cloudflare.comauthIn scope2026-11-14
cml-sso-proxy-orig.labs.cloudflare.comauthIn scope2026-11-14
cms.labs.cloudflare.comadminIn scope2026-11-14
cms-api.labs.cloudflare.comadmin, apiIn scope2026-11-14
content.labs.cloudflare.comIn scope2026-11-14
demo-api.labs.cloudflare.comapi, testIn scope2026-11-14
eunorth.labs.cloudflare.comIn scope2026-11-14
eunorth-one.labs.cloudflare.comIn scope2026-11-14
eunorth-two.labs.cloudflare.comIn scope2026-11-14
webssh.eunorth.labs.cloudflare.comIn scope2026-11-14
euwest.labs.cloudflare.comIn scope2026-11-14
ide-canary.labs.cloudflare.comstagingIn scope2026-11-14
idp.labs.cloudflare.comauthIn scope2026-11-14
idp-rag.labs.cloudflare.comauthIn scope2026-11-14
media.labs.cloudflare.comIn scope2026-11-14
public.labs.cloudflare.comIn scope2026-11-14
r2.labs.cloudflare.comIn scope2026-11-14
saml-auto.labs.cloudflare.comauthIn scope2026-11-14
saml-sso-auto.labs.cloudflare.comauthIn scope2026-11-14
eunorth.ssh.labs.cloudflare.comIn scope2026-11-14
eunorth-two.ssh.labs.cloudflare.comIn scope2026-11-14
uswest-two.ssh.labs.cloudflare.comIn scope2026-11-14
sso-auto.labs.cloudflare.comauthIn scope2026-11-14
sso-proxy.labs.cloudflare.comauthIn scope2026-11-14
client.sso.labs.cloudflare.comauthIn scope2026-11-14
staging.labs.cloudflare.comstagingIn scope2026-11-14
tg-probemanager.staging.labs.cloudflare.comstagingIn scope2026-11-14
tg-subs.staging.labs.cloudflare.comstagingIn scope2026-11-14
tech-summit.labs.cloudflare.comIn scope2026-11-14
terrasoup.labs.cloudflare.comIn scope2026-11-14
tg-probemanager.labs.cloudflare.comIn scope2026-11-14
tg-subs.labs.cloudflare.comIn scope2026-11-14
tokens.labs.cloudflare.comIn scope2026-11-14
uscentral.labs.cloudflare.comIn scope2026-11-14
uswest.labs.cloudflare.comIn scope2026-11-14
uswest-one.labs.cloudflare.comIn scope2026-11-14
uswest-two.labs.cloudflare.comIn scope2026-11-14
v2.labs.cloudflare.comIn scope2026-11-14
apjc.v2.labs.cloudflare.comIn scope2026-11-14
content.v2.labs.cloudflare.comIn scope2026-11-14
video-uploader.labs.cloudflare.comIn scope2026-11-14
lady.cloudflare.comIn scope2026-11-14
lara.cloudflare.comIn scope2026-11-14
laura.cloudflare.comIn scope2026-11-14
learn.cloudflare.comIn scope2026-11-14
ti-test.learn.cloudflare.comtestIn scope2026-11-14
linkdefender.cloudflare.comIn scope2026-11-14
links1.cloudflare.comIn scope2026-11-14
ram.dfw01.linode.cloudflare.comIn scope2026-11-14
linux.cloudflare.comIn scope2026-11-14
fred.r2.linux.cloudflare.comIn scope2026-11-14
lisa.cloudflare.comIn scope2026-11-14
liv.cloudflare.comIn scope2026-11-14
live.cloudflare.comIn scope2026-11-14
natetest.live.cloudflare.comIn scope2026-11-14
rtc.live.cloudflare.comIn scope2026-11-14
sip.rtc.live.cloudflare.comIn scope2026-11-14
vcr-api.live.cloudflare.comapiIn scope2026-11-14
logan.cloudflare.comIn scope2026-11-14
login.cloudflare.comauthIn scope2026-11-14
logs.cloudflare.commonitoringIn scope2026-11-14
ns.lucy.cloudflare.comIn scope2026-11-14
dns.luke.cloudflare.comIn scope2026-11-14
edgoo-pni.mad.cloudflare.comIn scope2026-11-14
magic-wan-connector.cloudflare.comIn scope2026-11-14
assets.magic-wan-connector.cloudflare.comIn scope2026-11-14
mconn-telemetry-staging.magic-wan-connector.cloudflare.comstagingIn scope2026-11-14
telemetry-production.magic-wan-connector.cloudflare.comIn scope2026-11-14
telemetry-staging.magic-wan-connector.cloudflare.comstagingIn scope2026-11-14
mail.cloudflare.commailIn scope2026-11-14
alm.alertmedia.mail.cloudflare.commailIn scope2026-11-14
email.px.mail.cloudflare.commailIn scope2026-11-14
staging.mail.cloudflare.commail, stagingIn scope2026-11-14
stg.mail.cloudflare.commail, stagingIn scope2026-11-14
mailstore1.cloudflare.comIn scope2026-11-14
malcolm.cloudflare.comIn scope2026-11-14
managed-defense.cloudflare.comIn scope2026-11-14
manga.cloudflare.comIn scope2026-11-14
mark.cloudflare.comIn scope2026-11-14
www.mark.cloudflare.comIn scope2026-11-14
martin.cloudflare.comIn scope2026-11-14
masque-relay.cloudflare.comIn scope2026-11-14
www.masque-relay.cloudflare.comIn scope2026-11-14
maya.cloudflare.comIn scope2026-11-14
mcp.cloudflare.comIn scope2026-11-14

18,935 names are covered by the program's own scope; 2 were first seen this week. Names come from ProjectDiscovery's public Chaos dataset (passive sources: certificate logs, DNS and other public data), matched to the program by its listing and its own domain scope. A name being in a dataset is not permission to test it: only what the program's own scope says is in scope, and its policy decides. CyberSIXT does not resolve, probe or scan these names. Tags come from the name alone. Source: ProjectDiscovery Chaos. Subdomains on the Atlas, or search the subdomains of every program.

A name in a dataset is not permission to test it: the program's own scope and rules decide. Data as of 2026-11-15.

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